/*
 * Win32 builtin functions
 *
 * Copyright 1997 Alexandre Julliard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "config.h"
#include "wine/port.h"

#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif

#include "windef.h"
#include "wine/winbase16.h"
#include "wine/library.h"
#include "module.h"
#include "file.h"
#include "ntdll_misc.h"
#include "wine/server.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(module);
WINE_DECLARE_DEBUG_CHANNEL(relay);

static HMODULE main_module;
static NTSTATUS last_status; /* use to gather all errors in callback */

/***********************************************************************
 *           BUILTIN32_dlopen
 *
 * The loader critical section must be locked while calling this function
 */
NTSTATUS BUILTIN32_dlopen( const char *name, void** handle)
{
    char error[256];

    last_status = STATUS_SUCCESS;
    /* load_library will modify last_status. Note also that load_library can be
     * called several times, if the .so file we're loading has dependencies.
     * last_status will gather all the errors we may get while loading all these
     * libraries
     */
    if (!(*handle = wine_dll_load( name, error, sizeof(error) )))
    {
        if (strstr(error, "cannot open") || strstr(error, "open failed") ||
            (strstr(error, "Shared object") && strstr(error, "not found"))) {
	    /* The file does not exist -> WARN() */
            WARN("cannot open .so lib for builtin %s: %s\n", name, error);
            last_status = STATUS_NO_SUCH_FILE;
        } else {
	    /* ERR() for all other errors (missing functions, ...) */
            ERR("failed to load .so lib for builtin %s: %s\n", name, error );
            last_status = STATUS_PROCEDURE_NOT_FOUND;
	}
    }
    return last_status;
}


/***********************************************************************
 *           load_library
 *
 * Load a library in memory; callback function for wine_dll_register
 */
static void load_library( void *base, const char *filename )
{
    UNICODE_STRING      wstr;
    HMODULE module = (HMODULE)base, ret;
    IMAGE_NT_HEADERS *nt;
    WINE_MODREF *wm;
    char *fullname;
    DWORD len;

    if (!base)
    {
        ERR("could not map image for %s\n", filename ? filename : "main exe" );
        return;
    }
    if (!(nt = RtlImageNtHeader( module )))
    {
        ERR( "bad module for %s\n", filename ? filename : "main exe" );
        last_status = STATUS_INVALID_IMAGE_FORMAT;
        return;
    }

    if (!(nt->FileHeader.Characteristics & IMAGE_FILE_DLL))
    {
        /* if we already have an executable, ignore this one */
        if (!main_module) main_module = module;
        return; /* don't create the modref here, will be done later on */
    }

    RtlCreateUnicodeStringFromAsciiz(&wstr, filename);
    if (LdrGetDllHandle(0, 0, &wstr, &ret) == STATUS_SUCCESS)
        MESSAGE( "Warning: loading builtin %s, but native version already present. "
                 "Expect trouble.\n", filename );
    RtlFreeUnicodeString( &wstr );

    len = GetSystemDirectoryA( NULL, 0 );
    if (!(fullname = RtlAllocateHeap( ntdll_get_process_heap(), 0, len + strlen(filename) + 1 )))
    {
        ERR( "can't load %s\n", filename );
        last_status = STATUS_NO_MEMORY;
        return;
    }
    GetSystemDirectoryA( fullname, len );
    strcat( fullname, "\\" );
    strcat( fullname, filename );

    /* Create 32-bit MODREF */
    if (!(wm = PE_CreateModule( module, fullname, 0, 0, TRUE )))
    {
        ERR( "can't load %s\n", filename );
        RtlFreeHeap( ntdll_get_process_heap(), 0, fullname );
        last_status = STATUS_NO_MEMORY;
        return;
    }
    TRACE( "loaded %s %p %p\n", fullname, wm, module );
    RtlFreeHeap( ntdll_get_process_heap(), 0, fullname );

    /* setup relay debugging entry points */
    if (TRACE_ON(relay)) RELAY_SetupDLL( (void *)module );
}


/***********************************************************************
 *           BUILTIN32_LoadLibraryExA
 *
 * Partly copied from the original PE_ version.
 *
 */
NTSTATUS BUILTIN32_LoadLibraryExA(LPCSTR path, DWORD flags, WINE_MODREF** pwm)
{
    char dllname[20], *p;
    LPCSTR name;
    void *handle;
    NTSTATUS nts;

    /* Fix the name in case we have a full path and extension */
    name = path;
    if ((p = strrchr( name, '\\' ))) name = p + 1;
    if ((p = strrchr( name, '/' ))) name = p + 1;

    if (strlen(name) >= sizeof(dllname)-4) return STATUS_NO_SUCH_FILE;

    strcpy( dllname, name );
    p = strrchr( dllname, '.' );
    if (!p) strcat( dllname, ".dll" );
    for (p = dllname; *p; p++) *p = FILE_tolower(*p);

    if ((nts = BUILTIN32_dlopen( dllname, &handle )) != STATUS_SUCCESS)
        return nts;

    if (!((*pwm) = MODULE_FindModule( path ))) *pwm = MODULE_FindModule( dllname );
    if (!*pwm)
    {
        ERR( "loaded .so but dll %s still not found - 16-bit dll or version conflict.\n", dllname );
        /* wine_dll_unload( handle );*/
        return STATUS_INVALID_IMAGE_FORMAT;
    }
    (*pwm)->dlhandle = handle;
    return STATUS_SUCCESS;
}

/***********************************************************************
 *           BUILTIN32_Init
 *
 * Initialize loading callbacks and return HMODULE of main exe.
 * 'main' is the main exe in case it was already loaded from a PE file.
 */
HMODULE BUILTIN32_LoadExeModule( HMODULE main )
{
    main_module = main;
    last_status = STATUS_SUCCESS;
    wine_dll_set_callback( load_library );
    if (!main_module)
        MESSAGE( "No built-in EXE module loaded!  Did you create a .spec file?\n" );
    if (last_status != STATUS_SUCCESS)
        MESSAGE( "Error while processing initial modules\n");

    return main_module;
}